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Energy Commodity Price Risk Managment (Details) - Energy Related Derivative	Dec. 31, 2018 MMBbls Bcf
Designated as Hedging Instrument [Member] | Crude Oil Fixed Price [Member]
Derivative [Line Items]
Net Open Position Long/(Short)	(21.6)
Designated as Hedging Instrument [Member] | Crude Oil Basis [Member]
Derivative [Line Items]
Net Open Position Long/(Short)	(13.7)
Designated as Hedging Instrument [Member] | Natural Gas Fixed Price [Member]
Derivative [Line Items]
Net Open Position Long/(Short) | Bcf	(33.3)
Designated as Hedging Instrument [Member] | Natural Gas Basis [Member]
Derivative [Line Items]
Net Open Position Long/(Short) | Bcf	(26.1)
Not Designated as Hedging Instrument [Member] | Crude Oil Fixed Price [Member]
Derivative [Line Items]
Net Open Position Long/(Short)	(0.5)
Not Designated as Hedging Instrument [Member] | Crude Oil Basis [Member]
Derivative [Line Items]
Net Open Position Long/(Short)	(4.5)
Not Designated as Hedging Instrument [Member] | Natural Gas Fixed Price [Member]
Derivative [Line Items]
Net Open Position Long/(Short) | Bcf	(4.5)
Not Designated as Hedging Instrument [Member] | Natural Gas Basis [Member]
Derivative [Line Items]
Net Open Position Long/(Short) | Bcf	(26.9)
Not Designated as Hedging Instrument [Member] | NGL and other fixed price
Derivative [Line Items]
Net Open Position Long/(Short)	(3.2)

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- Definition

Net Open Position Long/(Short) of Outstanding Commodity Forward Contracts to Hedge our Forecasted Energy Commodity Purchases and Sales

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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